Chiral Afterglow Materials for Imaging: High Dissymmetry Factor and Long Visualization Time via Cholesteric Liquid Crystal Polymers and Inorganic Phosphors

• • Achieved a high luminescence dissymmetry factor (g_CPA) of up to 0.74, significantly exceeding typical values for conventional CPA materials, enabling strong circular polarization contrast for imaging applications. • • Demonstrated a long visualization time of 7 minutes, far surpassing typical organic afterglow materials, which is critical for persistent imaging and optical storage. • • Developed processable, full-color CPA materials by embedding inorganic phosphors (Y2O2S:Eu,Mg,Ti, SrAl2O4:Eu,Dy, Sr2MgSi2O7:Eu) in cholesteric liquid crystal polymers, overcoming compatibility issues and enabling practical patterning. • • Implemented circular polarization differential imaging (CPDI) using the CPA materials, providing a novel imaging technique that leverages circular polarization for enhanced contrast and information content.